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ASE Automobile & Light Truck (A1–A8) — Practice Exam

A5 ABS, TCS and ESC: practice questions

Our ASE A1–A8 bank has 9 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1 · A5 Brakes

What is normal pedal feel during an ABS stop?

  1. Pulsation and possible noise from the hydraulic unit
  2. A pedal that sinks slowly to the floor while the system pumps
  3. No pedal at all
  4. A rock-hard pedal with no movement
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A. Pulsation and possible noise from the hydraulic unit — Drivers should keep firm pressure and steer.

Question 2 · A5 Brakes

What does a wheel speed sensor provide to the ABS module?

  1. A signal whose frequency varies with wheel speed
  2. Pedal travel
  3. Brake fluid pressure at that wheel's caliper
  4. Steering angle
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A. A signal whose frequency varies with wheel speed — Damaged tone rings or excess air gap cause erratic signals.

Question 3 · A5 Brakes

What should be done before welding on a vehicle with ABS and other modules?

  1. Disconnect the brake lines at the ABS unit and cap them to keep out dirt
  2. Remove all brake fluid
  3. Disconnect the battery and protect modules as the maker specifies
  4. Nothing special
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C. Disconnect the battery and protect modules as the maker specifies — Welding current can damage electronic modules.

Question 4 · A5 Brakes

Which sensors does electronic stability control use beyond wheel speed sensors?

  1. Oxygen and knock sensors
  2. Coolant temperature, oil temperature and throttle position sensors
  3. Fuel level sensor
  4. Steering angle, yaw rate and lateral acceleration sensors
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D. Steering angle, yaw rate and lateral acceleration sensors — It compares the driver's intended path with actual motion.

Question 5 · A5 Brakes

How can a passive (magnetic) wheel speed sensor be checked with a meter?

  1. Continuity to the brake line
  2. Resistance of the tone ring
  3. DC amperage with the wheel stopped and the ignition switched on
  4. Resistance check, and AC voltage while spinning the wheel
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D. Resistance check, and AC voltage while spinning the wheel — Active sensors need a powered test per service information.

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